Its completely reasonable. Do a quick google search and you'll find some prices nationwide. Lowest I've seen online is $10/each, most of prices are $20-30/each, most around $50/each

Yeah learn to do it yourself or find a friend/teammate that can do it. Gluing tires is pretty easy, often simpler than doing clinchers. If you are having a friend do it, don't make time demands or show up with multiple pairs of wheels that need to be glued for your race this weekend.